The McBurney YMCA, 125 W. 14th St., will hold its annual Splash Week April 5-9, offering free 40-minute swim lessons for adults and youth. The lessons cover the basics of floating, kicking and stroke development. Space is limited and participants must register in person at the Y by March 29. Swimmers will need to bring a bathing suit and swim cap. A lock to secure personal belongings is also recommended. For more information about regular swim classes, phone 212-741-9210.